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Darrol Stinton's statement on wing AR(aspect ratio) for minimum induced drag

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Pierre1

Active Member
Joined
Feb 3, 2015
Messages
38
Location
Paris
In Darrol Stinton's book 'The design of the aeroplane' page 143, it states that the wing AR of aeroplane around 13 to 15 makes induced drag a minimum while glider induced drag is minimum when wing AR is 40 or more. May I ask why there's a difference? It seems to me that the higher the wing AR, the smaller the induced drag.

Well, I'm not speaking about the other aspects, like the wing structure weight. The topic is only about wing AR and induced drag.
 
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